MCD3000 Series
42 MG.15.A4.22 - VLT is a registered Danfoss trademark
Fault Procedure
■ Fault Procedure
The MCD3000 Soft Starters include a range of
protection functions. Faults identified by these systems
are indicated with a trip code on the Local Control
Panel display. The following section of this manual
explains the trip codes and action required.
Procedures for faults not identified with a trip code are
detailed in the General Faults section.
The voltage of the soft starter is
dangerous whenever the equipment is
connected to the mains. Work on the
equipment should be carried out by
qualified personnel. Before performing any
maintenance and repair work, switch off the electrical
supply to the device and observe all safety regulations.
■
Trip Codes
When a protection function operates the MCD3000
enters a trip state and displays the following data.
• The trip LED is illuminated
• The [CODE] LED is illuminated indicating the
display is showing trip code data
ATTENTION
You can view motor temperature as calculated
by the MCD3000 motor thermal model by
using the [+/-] push buttons to scroll the numeric
display between current [AMPS], temperature [TEMP]
and trip code [CODE].
The trip code data is made up of two parts.
The first digit indicates the trip number. (The
MCD3000 has a trip log that records the last eight trip
events, trip number 1 is the most recent trip. Refer to
the next section of the manual for description of the
Trip Log).
The second digit indicates the cause of the trip
Code Cause & Action
0
Shorted SCR trip.
The MCD3000 has detected a shorted
SCR.
• Test the MCD3000 SCRs using the
Power Circuit Test described in the
Test and measurement procedures
chapter later in this section of the
manual.
• A shorted SCR trip can only be
reset by removing control voltage.
1
Excess start time trip.
The start time has exceed the maximum
limit programmed in Par. 10 Excess
Start Time Protection.
• Identify and remedy why the motor
is taking longer than normal to
accelerate.
• Reset the MCD3000
• Restart the motor.
2
Overcurrent trip.
The motor has experienced an overload
condition that exceeded its thermal
capability as programmed in Par. 6
Motor Thermal Capacity.
• Identify and correct the cause of the
overload.
• Wait for the motor to cool
sufficiently to allow a restart.
• Reset the MCD3000.
• Restart the motor.
In an emergency situation where it is
critical to immediately restart the motor
and overload protection of the motor is
a secondary concern, the MCD3000
overload protection can be reset by
temporarily removing control supply
voltage.
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